| ( | x | + | 41 | ) | × | 7 | ÷ | 2 | = | 217 |
| Left side of the equation = | ( | x | + | 41 | ) | × | 7 2 |
| ( | x | + | 41 | ) | × | 7 2 | = | 217 |
| Left side of the equation = | x | × | 7 2 | + | 41 | × | 7 2 |
| = | x | × | 7 2 | + | 287 2 |
7 2 | x | + | 287 2 | = | 217 |
7 2 | x | = | 217 | − | 287 2 |
7 2 | x | = | 147 2 |
| x | = | 147 2 | ÷ | 7 2 |
| = | 147 2 | × | 2 7 |
| = | 21 | × | 1 |
| x | = | 21 |